Platform-scale



(No Model.)

H. L. FISHER. PLATFORM SCALE.

No. 523,142. Patented July 17, 1894.

.within this frame and having the transverse piece A of the platform AUNITED STATES PATENT OFFICE.

HARVEY L. FISHER, OF DES MOINES, IOWVA.

PLATFORM-SCALE.

SPECIFICATION forming part of Letters Patent No. 523,142, dated July 17,1894.

Application filed May 25, 1893.

To rtZZ whom it may concern.-

Be it known that I, HARVEY L. FISHER, a citizen of the United States ofAmerica, residing at Des Moines, in the county of Polk and State ofIowa, have invented certain new and useful Improvements inPlatform-Scales, of which the following is a specification.

The objects of my invention are to cheapen the cost, simplify theconstruction, and increase the strength, durability and efficiency ofplatform scales, to place all of the bearings beneath the frame of thescales rather than under the platform and to construct the weighingmechanism in a compact manner so that a comparatively shallow pit willcontain all of the operative parts and retain the platform approximatelyat the ground sur-.

ace.

To this end my invention consists in the construction, arrangement andcombination of certain operative parts of the weighing mechanism ashereinafter set forth, pointed outin my claims and illustrated in theaccompanying drawings, in which-- Figure 1 is a bottom view of portionsof the platform, and weighing mechanism. Fig. 2 is a side view of thesame. Fig. 3- is an enlarged detail perspective view of the device togivhich the levers are pivoted at their inner en s.

Referring to the accompanying drawings the reference letter A is used todesignate the supporting sills or frame scales preferably placed over ashallow pit.

A designates the platform loosely placed cross pieces A beneath itsends.

The scale leversB are mounted beneath the sills or frame A and extendedin the same horizontal plane from the ends to the central portionthereof along each side, each one is supported by means of a link Bwhich is passed over the knife edged bearings B and secured to the hookB which latter is fixed to the sill or frame A. A short distanceinadvance of the knife edged bearings B isa like bearing 0 from whichdepends a link 0 which supports a hook O that is secured to the crossSaid levers B are disposed directly beneath the sills or frame A, in thesame horizontal plane and in parallel vertical planes.

Serial No. 475,537. (No model.)

D designates a rock shaft extended transversely of the central portionof the platform. At each end of said rock shaft is a device D adapted tobe permanently fixed thereto and having the lugs D projecting laterallytherefrom. D is a knife edged pivot in said lug. D is a link encirclingsaid pivot.

F designates a plate fixed to a, stationary support and containing aknife edged pivot 13 that supports said link D F is a lug projectinglaterally from the opposite side of the device D and F is a knife edgedpivot mounted therein to extend in opposite directions therefrom toconnect and support the inner ends of the two lovers B as shown in Figs.1 and 2.

The meeting ends of the levers B are supported at each side of thedevice by means of links .Twhich are passed over the knife edged pivot.This pivot F is located directlyin the transverse center of the weighingplatform, beneath the side sills or frame and it will be obvious thatany weight applied to the platform will cause the inner ends of thebeams shaft D.

J designates an arm extended laterally and outwardly from the rock shaftD to be normally in a horizontal position and J is a rod attachedthereto to connect with a suitable scale beam in an ordinary manner, sothat when the rock shaft D is moved the rod J will be pulled downwardly.

It is obvious that by showing only sections of the frame and theplatform in the drawings the operative parts can be shown on alargerscale than if the frame and platform were shown complete. It is alsoobvious that the rock shaft D extends across the center of the completescales and thatits supports at each end are to belike those shown at oneend only.

Having thus described my invention, what I claim as new therein, anddesire to secure by Letters Patent of the United States therefor, is

1. In a platform scales, the combination of the following elements, towit, suitable levers pivotally supported upon the end portions of astationary frame and extended to a rock shaft at the center of saidframe, a platform pivotally mounted upon said levers near their outerends as set forth, a rock shaft extended B to move downwardly andthereby rock the transversely of the platform near its central portionand pivotally supported as set forth from a stationary frame, a lugextending laterally from the end of said shaft, knife edged pivots inthe said lug and links connecting said pivots with the inner end of eachlever substantially as and for the purposes stated.

2. In a platform scales, a frame A, a platform A within said frame, across piece A a lever 13 extending from the side portion of the frameand pivotally supported from the said frame by means of a hook B securedthereto and a link B and bearing B to connect the lever therewith andconnected with the cross piece a by means of the bearing (J, a link 0and a fixed hook c as set forth, a rock shaft D having a device D on itsend, the lugs D projecting laterally therefrom, the knife edged pivots Din said lugs, links D encircling said pivots, the plate F fixed to astationary support, a pivot F in said plate to engage the links D as setforth, the lug F" projecting from the device D the pivot 1 in said lugand the links J to support the inner ends of the levers B from the pivotF and the arm J extended from one end of the rock shaft D, all arrangedand combined substantially as and for the purposes stated.

3. In a platform scales, a sill A, a rock shaft D and a device Dconnected with the endof said shaft and provided with integral lugs D"and F and pivots fixed in said lugs as shown, the levers B connectedwith the said lug F" by means of links and the pivots projecting fromthe lug, and the said rock shaft suspended from the sill A by means ofthe device D a link and the plate F havinga fixed pivot F all arrangedand combined to operate in the manner set forth for the purposes stated.

HARVEY L. FISHER.

Witnesses:

II. J. SHUNK, THOMAS G. Onwto.

